From 08e1566490c8e8c1bfa7d7753a55df3339f0031f Mon Sep 17 00:00:00 2001
From: Mayer Maximilian <Maximilian.Mayer@liebherr.com>
Date: Mon, 24 Oct 2022 09:51:49 +0200
Subject: [PATCH] feat: Add pod disruption budget to helm chart

Now it is possible to define the pod disruption budget.

Closes: #8222
---
 deploy/charts/emqx/templates/pdb.yaml | 18 ++++++++++++++++++
 deploy/charts/emqx/values.yaml        |  7 +++++++
 2 files changed, 25 insertions(+)
 create mode 100644 deploy/charts/emqx/templates/pdb.yaml

diff --git a/deploy/charts/emqx/templates/pdb.yaml b/deploy/charts/emqx/templates/pdb.yaml
new file mode 100644
index 000000000..a3f233064
--- /dev/null
+++ b/deploy/charts/emqx/templates/pdb.yaml
@@ -0,0 +1,18 @@
+{{- if and (.Values.pdb.enabled) (.Capabilities.APIVersions.Has "policy/v1/PodDisruptionBudget") }}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "emqx.fullname" . }}-pdb
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: {{ include "emqx.name" . }}
+    helm.sh/chart: {{ include "emqx.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  maxUnavailable: {{ .Values.pdb.maxUnavailable }}
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "emqx.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
diff --git a/deploy/charts/emqx/values.yaml b/deploy/charts/emqx/values.yaml
index b648f070f..7af0eff71 100644
--- a/deploy/charts/emqx/values.yaml
+++ b/deploy/charts/emqx/values.yaml
@@ -211,3 +211,10 @@ ssl:
   issuer:
     name: letsencrypt-dns
     kind: ClusterIssuer
+
+## Setting PodDisruptionBudget.
+## ref: https://kubernetes.io/docs/tasks/run-application/configure-pdb
+##
+pdb:
+  enabled: false
+  maxUnavailable: 1